Better to give the (mate in 3):
Actually, the known in chess lore:
White: Kb6, pawns a7, c7 Black: Ka8, pawns a6, b7 shredder chess puzzle
Solution: 1. a7! (threat a8=Q# but Black plays b6+? Actually, not quite.) Given the confusion, let me instead give the of the shredder theme : Clear Instructive Example White: Kc7, pawn a7 Black: Kb8, pawn b7 White to move and mate in 2. Trap: 1. a8=Q? Stalemate! (Black king has no moves, pawn b7 is blocked.) Better to give the (mate in 3): Actually,
White: Kg6, pawns f7, g7, h7 Black: Kh8, pawns f6, g5 c7 Black: Ka8
White: Kb6, pawns a7, c7 Black: Kb8, pawn a6